Calculation and analysis of the loss and heat on damper bars in large tubular hydro-generator

Open access

Abstract

In order to research the losses and heat of damper bars thoroughly, a multislice moving electromagnetic field-circuit coupling FE model of tubular hydro-generator and a 3D temperature field FE model of the rotor are built respectively. The factors such as rotor motion and non-linearity of the time-varying electromagnetic field, the stator slots skew, the anisotropic heat conduction of the rotor core lamination and different heat dissipation conditions on the windward and lee side of the poles are considered. Furthermore, according to the different operating conditions, different rotor structures and materials, compositive calculations about the losses and temperatures of the damper bars of a 36 MW generator are carried out, and the data are compared with the test. The results show that the computation precision is satisfied and the generator design is reasonable.

[1] Chao-Yang Li, The Application of Bulb-type Hydro-Generator Set at Low Head Hydropower Station. Developing 9: 145-146 (2006).

[2] Jing-Bin Guo, Analysis of Damaged Damping Winding and Magnetic Pole in Bulb Type Generator. Chinese Power 34(7): 63-67 (2001).

[3] Armor A.F., Chari M.V.K., Heat Flow in the Stator Core of Large Turbine Generators by the Methodof Three-Dimensional Finite Elements. IEEE Trans. on PAS. 95(5): 1648-1668 (1976).

[4] Armor A.F., Transient, Three-Dimensional, Finite-Element Analysis of Heat Flow in Turbine-GeneratorRotors. IEEE Trans. on PAS. 99(3): 934-946 (1980).

[5] Khan G.K.M., Buckley G.W., Bennett R.B., Brooks N., An Integrated Approach for the Calculationof Losses and Temperatures in the End-Region of Large Turbine Generators. IEEE Trans. on Energy Conversion 5(1): 183-194 (1990).

[6] Karmaker H.C., Broken Damper Bar Detection Studies Using Flux Probe Measurements and Time-Stepping Finite Element Analysis for Salient-Pole Synchronous Machines. Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, pp. 193-197 (2003).

[7] Knight A.M., Karmaker H., Weeber K., Prediction of damper winding currents and force harmoniccomponents in large synchronous machines. Proc.15th ICEM, p. 35 (2002).

[8] Knight A.M., Karmaker H., Weeber K., Use of a permeance model to predict force harmonic componentsand damper winding effects in salient pole synchronous machines. IEEE Trans. on Energy Conversion 17(4): 478-484 (2002).

[9] Traxler-Samek G., Lugand S., Schwery A., Add loss in the Damper Winding of Large Hydrogeneratorat Open-Circuit and Load Conditions. IEEE Trans. on Industrial Electronics 57(1): 154-160 (2010).

[10] Keller S., Xuan M.Tu., Simond J.-J., Chwery A., Large low-speed hydro-generator-unbalancedmagnetic pulls and additional damper losses in eccentricity conditions. IET Electr. Power Appl. 21(5): 657-664 (2007).

[11] Xia Hai-xia, Yao Ying-ying, Ni Guang-zheng, Analysis of ventilation fluid field and rotor temperaturefield of a generator. Electric Machines and Control 11(5): 472-476 (2007).

[12] Min-Qiang Hu, Xue-Liang Huang, Numerical Computation Method and its Application of ElectricMachine Performance. Nanjing: Southeast University Press (2003).

[13] Piriou F., Razek A., Finite element analysis in electromagnetic systemsaccounting for electric circuits. IEEE Trans on Magnetics 29(2): 1669-1675 (1993).

Archives of Electrical Engineering

The Journal of Polish Academy of Sciences

Journal Information


CiteScore 2016: 0.71

SCImago Journal Rank (SJR) 2016: 0.238
Source Normalized Impact per Paper (SNIP) 2016: 0.535

Cited By

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 166 162 9
PDF Downloads 60 59 7